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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d4ab0ca540bcab5f8aa82a6f0dd05fcfbf4490b6f2c43617aa7f8f2e61f4da' 
  AND token = 'I5Un615cJ1BBf9HnRAJjVgAdjdu0mkSv3TyfWWD43SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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