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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd97eb85faea71bc4a387f46475aacbd9214013da4bb291d006d666ab4532448' 
  AND token = 'MTxQbxswJkI1RKtps+pw/SW7J8nx+F586Z+2g6zzuKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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