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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47fed02c71f4e4ba9743c0a2dcff7c95a3a7153444e4c3f1ba7a52ca0762fa3' 
  AND token = 'CanJ/aqLgaMFukfPlM0Np0etZ0gOXp+68OlIeGUigNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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