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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5adbb5aa3334589b10ed71d35688647233823e72209ed3d166accd89fc0e95a' 
  AND token = 'N38FaELRzlr6pa/k7wkboFJyuZklol+8diMYSDsP4vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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