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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae02de1635fc40a17e404222d78d2516bb2d3237994db20c64f9cac93f82b6f' 
  AND token = 'fanti9CE+l23N7LerBk7zcTJNC4UoP7a4d+0KENQs9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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