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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f600a22c554209d85d0e6c4109129a69def6d5714ef79f6bb25f346217b66b9' 
  AND token = 'N4rczy1DmyqGHd1rzDc9EVeRXQSjsEZ3IxXyHKVgV8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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