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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb9b32fa7083fea17d402fc14654e608011184cf19ea0ed41bb318503be0d47' 
  AND token = 'seU1gY2Qgcj4rdZ8KG5q/0MPc5ImwLc2A39YXCDaTdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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