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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510939985f89af342548a09de57dafc583342002b7b30a9c105b4d056f846b27' 
  AND token = 'EUc4VW9HZaStFxG5eR+tn5W3gYY+ipeICeyZM3K9KL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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