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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff02f24ebb56b5d7c522b5793c583517ae6c7d8508997ec5c361372525c1b71f' 
  AND token = 'w7VKZRBiwG2ryk4fDeEChaALrarpy9lKkO/BJwUmCZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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