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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8b36854e28f5168084130ad5d245a4af5e0d958921e32bd6557abc1a3a4442' 
  AND token = 'wBETB2ZR41D9Db+L6uoFinXpYKg9Tv1I1KSWcJvNhI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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