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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee026a8c9df28137165a9c81e104f529f095dc3433b1ada39490d6e85d114ad3' 
  AND token = 'MFWA95aNTL7oINkii2MPfG4XaQ6LwyHjuUqjPyDGcxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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