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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1b4c457fe14e4d4557bb786e3997852155c2ee40d5ec5c6dfa2bb3daafc44c' 
  AND token = 'KLJA7k1LV+0hGP6NyT+eLH2axc2UhMricTrkZkHJYXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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