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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4175c9009cd76a6e8078af5ea221cf23a39f806aa5ef773d306f7f1628ba2319' 
  AND token = 'EJBSptjt8TScz5age0BU96/txcrmJfGE7Qtaq/9bNBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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