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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b08ca7aa72aa0c1fa068e30993532e0e9a07dc4f51fb0ed3a297e61cc639a45' 
  AND token = 'vS1pIv9kzc/f5thUu0aoDFzZDoX7IN1201H2O3c35xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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