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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7222314bc3e23f7b954edcc03d3881ea5eb729b4d446a2518fcfd413d2f37d5' 
  AND token = 'yk4k4/ry3IL9qKTT0VEy0VD2FJ7LJMm2QLdNwUqcgb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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