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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68625d6fe3376547a9d7db26b521fbe003038d5e323ba6ac493c0c114c7473f4' 
  AND token = 'hAIR8C8MKB7FcbO+2a1DsadBJOwdZ4Tb0UXO/E92SNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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