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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cdd1f3e5600435c496e0c488b9ebd9993b2e941536ce6d0dc35b81d58abdcb' 
  AND token = '8/BxR19mFoDpPeT3NW0oWgMb4eQheN2GLXeb0gYNbk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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