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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bec79b0a09d298984f8e33770e5bb73c9e35fb4d9f1519f7e2f2fb6ea9cd79' 
  AND token = 'Mao2uX2DGv5UediX3+jLQaD0CgA2ETwNBEa0pDG+llo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}