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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36731e3169bb7d18a3926965ef275c4d45810e6c95ff4787ee94855c22bd5c8' 
  AND token = 'R9AV+27Q3Bei7wGGCkvwCdzG5MBG9G7TL5vNm/fhAdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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