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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b402abe955a77b6fbce0be3d41d0796d6482ae099f35803b4e3c11b39dd681ba' 
  AND token = 'PwvoVtzzw1btFrQbDww38hdY85Kt1Ug+g8CK/6DCaNY=' 
  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"
    }
  }
}