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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de3fdf5e44c2ff5d2f4ab97d766eb55aeb5eec77ed2b6c4c91994c18b60f3ab' 
  AND token = 'N2wo9eIrESFX11UFpe/iA8AiLkydAFnqnC+gn+mKpc8=' 
  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"
    }
  }
}