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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6794aac9be1d43c693d47e87105430b0b3cbe9d072e8f1d9e4590ce157383a8' 
  AND token = '7CvnSvAPIPa/C32TioouQB4o08j1hdoUNEGCuhUbVjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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