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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1694a91217f29908aeb473348b0103d2b8b7637e7e3ab7c53d0ef4d706c9f7' 
  AND token = 'as89PCuCZxE8DVVPDAatHk/Jnk9eOT1dRqZnbVj/dsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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