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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d98ae0ebadea589cb5285d24e6dbee349cdb306994b0635a387ad81122fca13' 
  AND token = 'vkOIIaewerdBJ895RrAWMzjs4+bXNd4Ciku3U3grdt4=' 
  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"
    }
  }
}