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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9f3ded32b790e5ba1178d95d9a4678200424eac19e0e987abca9eb23e3e218' 
  AND token = '8WK74GuRZMVicfWkhOXYVdjm828Nrycq3nsCl70N/Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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