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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4869fea46202adab0d42b2a7e0ffc8c6fef3876d7be3a6c6cff99ec69b99b8bf' 
  AND token = 'U3i/7OVL5j9IPEpKWDpyW9OnfwsrnPZt2Hyjeev3I9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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