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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d30f6454a67231b1c3cce5c2d007996bafdc05bbbc4cbbc71c954650b89a51' 
  AND token = 'mhrmgBcSc9qUKxmZEQAHPeXklDnYMohZKYIXewMFRXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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