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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c48236af2455003a315e933b948aef941da9ed7dc4cab23b9be07d30666551' 
  AND token = 'NnJo1yK5NAm+wSBIAlEFm8ZSsCfQ09X7JaPHgNR1b1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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