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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2223a7d4c035df0bc69ccb4ed7410fc8416c122085a7d366d0e78d39a3344f8' 
  AND token = '8IbPp7bUp7rGeRbioMkMiU4h2/bcry3YVs6zDwQE2XU=' 
  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"
    }
  }
}