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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f9bea1e51c8626ef7ac2a9460e58f68c382867ff8b6bef00c4d51c50406a49' 
  AND token = 'o/MUZZPc6IXbwVOkNSFJk5sG/tyDES13FCSJi2ti8ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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