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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7909246c9d14ec11934fdecee2b177a8cb5e31a6852c92ea86d9269ec3fb9b97' 
  AND token = 'Okm/ecL+cjVahxPN+vkb58GYgW6DnC62ap8Y2st7b+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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