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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6986dd05fdc59a1ad063c73aacb2e76322e1a053b6c1212249e2a43fa707ba08' 
  AND token = 'tFp4PXCl4PSGFk8FkuZTUPfZGhsWLY6Xlld+7U0IpjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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