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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177921bc0c878bcc2c59a7cb51a63073b6d03240d20c897953a3b302e3b6aabb' 
  AND token = 'ZeUbb1/RbynX7u3KnvmMDB9t2/5u/ZHBTiambIp7tdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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