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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969beb26e953705a9bfb4bc67df59ee651e4f3c632b52160a4885fa971e50f77' 
  AND token = 'taduTHc76WvkC6ODIGlTR90xqM5rtcqAmSE9g4MrBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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