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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f27ba27a4db8a151233c42ed8323ccc21576597dca148e65d020e7e6848dda3' 
  AND token = '14bi8ZBL/mTceBhIsVr0gbtv4qvgVaRBEC4Fh9COOTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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