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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb0db71b5067bb97d2c5cb4db999a6800a3d7b6f644e277fe519a68531298d0' 
  AND token = '+REw6gRWevgnekqtH2SSWJ7LqQZOhNlonk4W5KNjTuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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