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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf71e4503f966f4f1da9ad6a793bb3258419ca077f2af44036a1e2dbb6ac37f' 
  AND token = '/mYV4tfPDQjtnEzPZbebqkon4uCJR00lwA29lNHAfAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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