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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acce07e838b5d526ccbbe486d93f724a5ce780b71571a59201b31417e0ecd693' 
  AND token = 'H5FG/gYVSSeVAKNo3AGEeWPHRqY/7JSibBiYfpQGY4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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