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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91be50156934d6496cc39097077aa88bc8ef1f069a2eb50384f7833465c9a3de' 
  AND token = '1fMtpZ1ld1vv1DTlgSVBgDmM57j5YtDNYzhKj9+2EAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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