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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0730e8e45a7dd660a6012093f92fe5eba05ce39c316b69316311f135e973b76b' 
  AND token = 'reEZ8ONYXxGV1up29Pk1nV3ApvrlfpUQ7vfWWjxXk3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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