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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510879c5ae4c5e254004e2f285861552cd4bb72d46a44f2acbe6768d02915d2b' 
  AND token = 'GJSFTvAviIRwj+IJe9NTma/4OES9yMSQknC+534BJ+M=' 
  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"
    }
  }
}