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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b4938da6f03526d8766ac4dd791445b4ccf556a453b404fec8db01fba447a9' 
  AND token = '6u38xslhKQZK8afAwg5H3Ue5MWip/GT8mciZJd1io+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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