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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91dd6baf14648fc3d03b9d25074408222576b5b6df8ed7bceef3c640663c7dac' 
  AND token = 'bXf+kjv8ymEX4O145GTAF8j95E5x275EDbco0O9rd+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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