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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90af6e91aef0e639c9d87996fce45ba87eb0f2d0c32d7f6d2b594c23a9ab075' 
  AND token = '5lCLWgQYsExEPeQd1PZYlotUwltiq7+iBPj0EZjJ1CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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