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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2f1de379708ff733717014b0f90a8f7ac746dc8ffed1976f4fdf227b49ee1e' 
  AND token = 'SHwjGYLBqEV1Wow9YLeyk3j8uf8Os8kb59Sa85qi1WA=' 
  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"
    }
  }
}