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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbfe4655767e510b7f61e8ea2fc33ce6a8d672c4fd483cf33f11080235ef836' 
  AND token = 'bWYe/pzICYM3TSBSqrd+SIAFwkx46rIC7W5HfgUDjKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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