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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc60a668b4d0248f847191c51bce8df6ed125285c4af800a51a39c4767766311' 
  AND token = 'Rx2X9lhZ/pO6DHLZg+zA9b1AtlX6NfLZOeOMZBU7xWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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