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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3190b1608b6f87761bd5e03796defb83c1f27e1baad3bdb9bef3537c4c5bb9b' 
  AND token = 'PeJ0QvR6keQaa4pUaoabbMFeHaFcvT8WqYGRPgGH2lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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