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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb398bc3a472169c08d1c7906d6bdebb8e37e3c44eb5b0001f45fa1aee2abf3' 
  AND token = 'fzOx3wigbPRcZWA18/k84lTej52o9EuWjqHT2rRwFw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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