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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8e883d80a985551c47ccc21e72ec21eaa7e4a891466319c2c87c77e8c67b90' 
  AND token = 'IeWgK7a8yxX6QauHg5+TyotHe0sEFOy1rYQsF0M63KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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