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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5247d3bc252fdaab15776c2ecf98e85e2475131081cda3cabcc49e604f378a7' 
  AND token = 'FUNs7CHfg0tndNah5Hm8Rm+WoQQfNwkr0iT3gPO35Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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