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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49dbbf9d0df7a93474ffe1b23816819223966c50fe9efccda8fea77402e7201e' 
  AND token = 'OaLMhF7sVHLw57l7rSQtmBpycf8Ji9M88+rHbTLzOYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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