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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3bf391e1fd72d35d4464a35bb486656c5d139ccdf895224381f64fa69c6789a' 
  AND token = '/pOXc9xAQs9PhEVoqy/QzTqscqB/lBMMf4lccTh5JoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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