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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e362b3232835bd8bd762cce4c4dd8285fd61c02edd7e64c69448a5e7175c3e5' 
  AND token = '90UxMpnP8gTxJnYSfEcg3zduw/9vEn4kwYXY82qi0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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